EP0724915B1 - Hydrolack für Antihaft-PTFE-Beschichtung von geformten Aluminiumartikeln oder Aluminiumband - Google Patents

Hydrolack für Antihaft-PTFE-Beschichtung von geformten Aluminiumartikeln oder Aluminiumband Download PDF

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Publication number
EP0724915B1
EP0724915B1 EP96101186A EP96101186A EP0724915B1 EP 0724915 B1 EP0724915 B1 EP 0724915B1 EP 96101186 A EP96101186 A EP 96101186A EP 96101186 A EP96101186 A EP 96101186A EP 0724915 B1 EP0724915 B1 EP 0724915B1
Authority
EP
European Patent Office
Prior art keywords
weight
parts
ptfe
formulation
aqueous dispersion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96101186A
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English (en)
French (fr)
Other versions
EP0724915A1 (de
Inventor
Claudio Giuseppe Bignami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akzo Nobel Coatings SpA
Original Assignee
Akzo Nobel Non Stick Coatings SRL
Akzo Nobel Non Stick Coatings LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akzo Nobel Non Stick Coatings SRL, Akzo Nobel Non Stick Coatings LLC filed Critical Akzo Nobel Non Stick Coatings SRL
Priority to SI9630332T priority Critical patent/SI0724915T1/xx
Publication of EP0724915A1 publication Critical patent/EP0724915A1/de
Application granted granted Critical
Publication of EP0724915B1 publication Critical patent/EP0724915B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
    • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes

Definitions

  • the present invention relates to a PTFE-based water paint for a non-stick and very high abrasion resistant coating of a pre-degreased aluminium support. It is a major object of the invention to provide a formulation suitable for constituting the primer and containing:
  • a further primer formulation according to the invention still containing 1 to 6 parts by weight of the aforesaid anti-abrasive, consists of the following ingredients:
  • PTFE weight ratios of said ingredients, referred to PTFE, PPS and PAI on dry basis, are approx. as follows: PTFE/PPS of 35/65 to 55/45; PAI resin content on dry basis less than 10% of PTFE+PPS (on dry basis), carbon black content of 10% to 15% of PTFE+PPS+PAI.
  • the above formulation may contain further acrylic resin in form of aqueous dispersion in amount corresponding to 1 - 1.5 parts by weight (dry substance) on 100 parts by weight of formulation.
  • the non-stick coating is obtained with a primer overlaid with a top coat as a finish.
  • a particularly suitable top coat composition is as follows (herein marked LBD.4):
  • Ingredient b) consists of DMPS modified with oxyalkylene (oxyethylene and/or oxypropylene) units at an oxyalkylene units/siloxane units (CH 3 ) 2 SiO ratio ranging between 92:8 and 88:12 by weight.
  • oxyalkylene oxyethylene and/or oxypropylene
  • Ingredient b as an aqueous dispersion, may advantageously consist of product BYC 302 (BYC Chemie) containing 90% by weight of polyether (ethoxy and/or propoxy) groups.
  • Prior art document GB 833.899 discloses the use of silicones in combination with PTFE in order to form coating layer with reduced adherence tendency of substances to the surface.
  • silicones this document mentions only methylphenyl silicones and methylsilicone, in no way polyxyalkyllene-modified dimethylpolysiloxanes are cited.
  • the silicones are used prevainlingly in the primer layer: according to the present invention instead the silicones (of the "modified" type) are used only in the top coat, not in the primer layer.
  • the coating according to the present invention may be applied to aluminium shaped articles such as pots, pans, lids, mixing spoons and all other utensils usually employed for food preparation and cooking (baking pans, oven racks, etc.) as well as to aluminium sheet to be shaped into the aforesaid articles.
  • aluminium shaped articles such as pots, pans, lids, mixing spoons and all other utensils usually employed for food preparation and cooking (baking pans, oven racks, etc.) as well as to aluminium sheet to be shaped into the aforesaid articles.
  • the formulation specified in Table 2 is particularly appropriate.
  • the aluminium support is simply predegreased according to one of the known methods, i.e. in an alkaline or acid environment, or with organic solvents. In any case, the resulting aluminium support maintains the Ra surface roughness of the aluminium sheet, i.e. lower than 1.2 ⁇ .
  • the coating is realized by applying the formulation for the primer and subjecting the coated manufactured articles to a forced air flow in order to dry the layer of the primer formulation (without overcoming 120°C). Then the top coat formulation is applied and the painted article. is finally subjected to the caking in oven at a temperature between 380° and 440°C preferably between 410° and 430°C.
  • the claimed coating exhibits an excellent adhesion to the aluminium support, without having to be subjected to pretreatments (sand-blasting, grinding) meant for roughness increase.
  • the paint added with cristobalite exhibits an extraordinary increase in the abrasion resistance when compared with formulations of identical composition except for the mineral filler being other than cristobalite (see Table 3).
  • the Applicant's test was conducted by measuring the coating thickness after each series of 250 abrasion cycles to total wearing out of the coating. The behaviours of the various samples toward the abrasion resistance were thus clearly evidenced.
  • Cristobalite particle size too is to be selected to obtain a coating of superior qualities: in fact, a coating of the final product based on a paint formulation coontaining larger particle sized cristobalite H. (Sibelco B0006) was found to be inadequate as it was excessively rough.
  • a salient advantage of the present invention is that the claimed paint exhibits an excellent abrasion resistance when applied to an aluminium support of very low roughness corresponding to that of the aluminium sheet currently used for the manufacture of articles according to the present invention. It follows that there is no need for increasing the surface roughness - which usually contributes to the improvement in abrasion resistance - by adequate mechanical treatments, such as grinding and sand-blasting (see Table 4).
  • Fig. 1 is a graph illustrating the results shown in Table 2.
  • Fig. 2 is a graph illustrating the results shown in Table 3.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Wrappers (AREA)
  • Adhesive Tapes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (4)

  1. Verfahren zum Erhalten einer Antihaftbeschichtung auf PTFE-Basis auf ausgeformten Aluminiumartikeln oder Aluminiumband, das bei der Herstellung besagter Artikel verwendet werden soll, bestehend aus den folgenden Verfahrensschritten:
    a) Aufbringen einer Formulierung, die geeignet ist, die Grundierung darzustellen, und die folgende wesentliche Inhaltsstoffe enthält:
    kommerzielle wäßrige PTFE-Dispersion, die 60 Gew.-% PTFE und herkömmliche Tenside enthält;
    PAI-Harz als eine Lösung in N-Methylpyrrolidon;
    Ruß;
    Cristobalit, in einer Menge, die 1 bis 6 Gewichtsteilen pro 100 Gewichtsteile Formulierung entspricht;
    herkömmliche Tenside und Wasser (Rest auf 100 Gewichtsteile);
    b) Trocknen der Grundierungsformulierungsschicht durch einen Zwangsluftstrom in solchen Arbeitsbedingungen, daß 120°C nicht überschritten werden;
    c) Aufbringen einer Formulierung, die geeignet ist, die Deckschicht auf der Grundierung darzustellen, und die folgende wesentliche Inhaltsstoffe enthält:
    kommerzielle wäßrige PTFE-Dispersion, die 60 Gew.-% PTFE und herkömmliche Tenside enthält;
    Polyoxyalkylen-modifiziertes DMPS, in einer Menge von 2 bis 4 Gew.-% des PTFE;
    Acrylpolymere, als eine wäßrige Dispersion, in einer Menge von bis zu maximal 2 Gew.-% des PTFE;
    d) erschöpfendes Aushärten der Beschichtung bei 380° bis 440°C.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß für die "Deckschicht"-Formulierung ein DMPS verwendet wird, das mit Oxyalkylen(Oxyethylen und/oder Oxypropylen)-Einheiten modifiziert ist, mit einem Verhältnis von Oxyalkylen-Einheiten/Siloxan-Einheiten (CH3)2SiO im Bereich zwischen 92:8 und 88:12, gewichtsbezogen.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Formulierung für die Grundierungsschicht enthält:
    kommerzielle wäßrige PTFE-Dispersion, die 60 Gew.-% PTFE und herkömmliche Tenside enthält, in einer Menge, die 18 Gewichtsteilen PTFE pro 100 Gewichtsteile Formulierung entspricht;
    PAI-Harz als eine Lösung in N-Methylpyrrolidon, in einer Menge von 4,4 Gewichtsteilen;
    Ruß, in einer Menge von 1,5 Gewichtsteilen;
    kolloidales Siliciumdioxid in einer wäßrigen Dispersion mit 30 Gew.-%, in einer Menge von 20 Gewichtsteilen,
    Cristobalit, in einer Menge von 4 Gewichtsteilen;
    herkömmliche Tenside, Lösungsmittel und Wasser (Rest auf 100 Gewichtsteile).
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Formulierung für die Grundierungsschicht enthält:
    kommerzielle wäßrige PTFE-Dispersion, die 60 Gew.-% PTFE und herkömmliche Tenside enthält, in einer Menge, die 11,4 Gewichtsteilen PTFE pro 100 Gewichtsteile Formulierung entspricht;
    PAI-Harz als eine Lösung in N-Methylpyrrolidon, in einer Menge von 2,25 Gewichtsteilen;
    PPS-Harz in Pulverform, in einer Menge von 12 Gewichtsteilen;
    Acrylharz in einer wäßrigen Dispersion in einer Menge, die 1,44 Gewichtsteilen entspricht (Trockenmasse);
    Ruß, in einer Menge von 3,5 Gewichtsteilen;
    Cristobalit, in einer Menge von 4 Gewichtsteilen;
    herkömmliche Tenside, Lösungsmittel und Wasser (Rest auf 100 Gewichtsteile).
EP96101186A 1995-01-31 1996-01-29 Hydrolack für Antihaft-PTFE-Beschichtung von geformten Aluminiumartikeln oder Aluminiumband Expired - Lifetime EP0724915B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630332T SI0724915T1 (en) 1995-01-31 1996-01-29 Water paint for non-stick PTFE-based coating of shaped aluminium articles or aluminium sheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950159 1995-01-31
ITMI950159A IT1273477B (it) 1995-01-31 1995-01-31 Vernice all'acqua atta a realizzare rivestimenti antiaderenti a base di ptfe,su manufatti stampati o su lastra di alluminio

Publications (2)

Publication Number Publication Date
EP0724915A1 EP0724915A1 (de) 1996-08-07
EP0724915B1 true EP0724915B1 (de) 2001-08-01

Family

ID=11370369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101186A Expired - Lifetime EP0724915B1 (de) 1995-01-31 1996-01-29 Hydrolack für Antihaft-PTFE-Beschichtung von geformten Aluminiumartikeln oder Aluminiumband

Country Status (9)

Country Link
EP (1) EP0724915B1 (de)
AT (1) ATE203691T1 (de)
DE (1) DE69614160T2 (de)
DK (1) DK0724915T3 (de)
ES (1) ES2161305T3 (de)
GR (1) GR3036952T3 (de)
IT (1) IT1273477B (de)
PT (1) PT724915E (de)
SI (1) SI0724915T1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7695807B2 (en) 2006-04-04 2010-04-13 E.I. Du Pont De Nemours And Company Non-stick finish
US7772311B2 (en) 2006-04-04 2010-08-10 E.I. Du Pont De Nemours And Company Non-stick finish composition
US8158251B2 (en) 2008-02-07 2012-04-17 E. I. Du Pont De Nemours And Company Article with non-stick finish and improved scratch resistance

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044544A1 (en) * 1997-04-03 1998-10-08 W.L. Gore & Associates, Inc. Low dielectric constant material with improved dielectric strength
DE29813967U1 (de) * 1998-08-04 1998-10-08 Sick Ag Gehäuse
US20070282044A1 (en) * 2006-05-31 2007-12-06 Robert John Cavanaugh Concentrated fluoropolymer dispersions stabilized with anionic polyelectrolyte dispersing agents
NL2000218C2 (nl) 2006-09-07 2008-03-12 Bravilor Holding Bv Bereidingsinrichting.
FR2995312B1 (fr) 2012-09-12 2015-07-03 Vallourec Mannesmann Oil & Gas Procede de preparation d'une dispersion aqueuse stable de polyamide-imide exempte de substance cancerogene, mutage ou reprotoxique et application aux revetements

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL222072A (de) * 1956-11-16 Union Chimique Belge Sa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7695807B2 (en) 2006-04-04 2010-04-13 E.I. Du Pont De Nemours And Company Non-stick finish
US7772311B2 (en) 2006-04-04 2010-08-10 E.I. Du Pont De Nemours And Company Non-stick finish composition
US8158251B2 (en) 2008-02-07 2012-04-17 E. I. Du Pont De Nemours And Company Article with non-stick finish and improved scratch resistance

Also Published As

Publication number Publication date
SI0724915T1 (en) 2001-12-31
GR3036952T3 (en) 2002-01-31
ITMI950159A1 (it) 1996-07-31
EP0724915A1 (de) 1996-08-07
DK0724915T3 (da) 2001-10-01
PT724915E (pt) 2002-01-30
ES2161305T3 (es) 2001-12-01
DE69614160T2 (de) 2001-11-15
IT1273477B (it) 1997-07-08
ATE203691T1 (de) 2001-08-15
DE69614160D1 (de) 2001-09-06
ITMI950159A0 (it) 1995-01-31

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